{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/vendors/silverstripe/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-54721"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["userforms"],"_cs_severities":["high"],"_cs_tags":[],"_cs_type":"advisory","_cs_vendors":["Silverstripe"],"content_html":"\u003cp\u003eThe Silverstripe userforms module is affected by a critical remote code execution (RCE) vulnerability, tracked as CVE-2026-54721. The vulnerability stems from improper input validation within the CMS's email subject field configuration. An attacker with low-level administrative privileges capable of modifying form settings can submit a specially crafted payload into the email subject field. The application fails to neutralize special characters before processing, allowing the server to interpret the input as executable code. This flaw resides in multiple versions of the userforms module, specifically releases prior to 6.4.9, versions 7.0.x before 7.0.7, and versions 7.1.x before 7.1.1. Given the severity of arbitrary code execution, organizations utilizing Silverstripe CMS with the userforms module should prioritize patching to the latest stable versions immediately.\u003c/p\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-54721 grants an attacker the ability to execute arbitrary code on the underlying web server with the privileges of the web application service account. This allows for full compromise of the application's confidentiality, integrity, and availability. Data exfiltration, modification of application logic, and potential lateral movement into the hosting environment are primary risks if the application is compromised.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade the Silverstripe userforms module to versions 6.4.9, 7.0.7, 7.1.1, or later to address CVE-2026-54721.\u003c/li\u003e\n\u003cli\u003eReview CMS audit logs to identify unauthorized modifications to form settings or unusual changes to email notification configurations.\u003c/li\u003e\n\u003cli\u003eAudit administrative access to the Silverstripe CMS to restrict the number of users capable of modifying sensitive form settings.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-08-27T21:09:49Z","date_published":"2026-08-27T21:09:49Z","id":"https://feed.craftedsignal.io/briefs/2026-08-silverstripe-rce/","summary":"An improper input validation vulnerability (CVE-2026-54721) in the Silverstripe userforms module allows authenticated attackers to achieve remote code execution by injecting malicious payloads into the email subject field.","title":"Remote Code Execution in Silverstripe Userforms Module","url":"https://feed.craftedsignal.io/briefs/2026-08-silverstripe-rce/"}],"language":"en","title":"CraftedSignal Threat Feed - Silverstripe","version":"https://jsonfeed.org/version/1.1"}